why directional light works like a spotlight?

back to this . i tried using Sky Light with Cubemap with 1 side white and all the other black, the result is still unacceptable, because of the loading issue . i also tried to make the SL Static and compile the lighting, the issue became even worse .

if the Sky Light is made Stationary, somewhy the white color is merged with the mesh’s

transparent color is treated by Sky Light the same way as black .

i would highly appreciate any help .